linux-kernel - Re: [ 36/40] mm: vmscan: convert global reclaim to per-memcg LRU lists

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Date:	Mon, 30 Jul 2012 01:25:17 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk
Subject: Re: [ 36/40] mm: vmscan: convert global reclaim to per-memcg LRU
 lists

On Thu, 2012-07-26 at 14:29 -0700, Greg Kroah-Hartman wrote:
> From: Greg KH <gregkh@...uxfoundation.org>
> 
> 3.0-stable review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> From: Johannes Weiner <jweiner@...hat.com>
> 
> commit b95a2f2d486d0d768a92879c023a03757b9c7e58 upstream - WARNING: this is a substitute patch.
> 
> Stable note: Not tracked in Bugzilla. This is a partial backport of an
> 	upstream commit addressing a completely different issue
> 	that accidentally contained an important fix. The workload
> 	this patch helps was memcached when IO is started in the
> 	background. memcached should stay resident but without this patch
> 	it gets swapped. Sometimes this manifests as a drop in throughput
> 	but mostly it was observed through /proc/vmstat.
[...]
> The impact of the accidental fix is to make it harder for kswapd to force
> scan small targets by taking zone->all_unreclaimable into account. This
> patch is the closest equivalent available based on what is backported.
> 
> ---
>  mm/vmscan.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
[...]

This is missing sign-offs.

Ben.

-- 
Ben Hutchings
It is impossible to make anything foolproof because fools are so ingenious.

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